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<?php
namespace SMW\DataValues\ValueValidators;
use SMW\PropertySpecificationLookup;
use SMW\DIWikiPage;
use SMWDataValue as DataValue;
use SMW\RequestOptions;
use SMW\Store;
/**
* @private
*
* Only allow values that are unique where uniqueness is establised for the first (
* in terms of time which also entails that after a full rebuild the first value
* found is being categorised as established value) value assigned to a property
* (that requires this trait) and any value that compares to an establised
* value with the same literal representation is being identified as violating the
* uniqueness constraint.
*
* @license GNU GPL v2+
* @since 2.4
*
* @author mwjames
*/
class UniquenessConstraintValueValidator implements ConstraintValueValidator {
/**
* @var Store
*/
private $store;
/**
* @var PropertySpecificationLookup
*/
private $propertySpecificationLookup;
/**
* @var boolean
*/
private $hasConstraintViolation = false;
/**
* Tracks annotations for the current context to verify that a subject only
* contains unique assignments.
*
* @var array
*/
private static $annotations = [];
/**
* @since 2.4
*
* @param Store $store
* @param PropertySpecificationLookup $propertySpecificationLookup
*/
public function __construct( Store $store, PropertySpecificationLookup $propertySpecificationLookup ) {
$this->store = $store;
$this->propertySpecificationLookup = $propertySpecificationLookup;
}
/**
* @since 2.4
*
* {@inheritDoc}
*/
public function hasConstraintViolation() {
return $this->hasConstraintViolation;
}
/**
* @since 3.0
*
* {@inheritDoc}
*/
public function clear() {
self::$annotations = [];
}
/**
* @since 2.4
*
* {@inheritDoc}
*/
public function validate( $dataValue ) {
$this->hasConstraintViolation = false;
if ( !$this->canValidate( $dataValue ) ) {
return $this->hasConstraintViolation;
}
$property = $dataValue->getProperty();
if ( !$this->propertySpecificationLookup->hasUniquenessConstraint( $property ) ) {
return $this->hasConstraintViolation;
}
$contextPage = $dataValue->getContextPage();
// Exclude the current page from the result match to check whether another
// page matches the condition and if so then the value can no longer be
// assigned and is not unique
$requestOptions = new RequestOptions();
$requestOptions->addExtraCondition( function( $store, $query, $alias ) use( $contextPage ) {
return $query->neq( "$alias.s_id", $store->getObjectIds()->getId( $contextPage ) );
}
);
$requestOptions->setLimit( 2 );
$count = 0;
if ( !$this->hasAnnotation( $dataValue ) ) {
$entityValueUniquenessConstraintChecker = $this->store->service( 'EntityValueUniquenessConstraintChecker' );
$res = $entityValueUniquenessConstraintChecker->checkConstraint(
$property,
$dataValue->getDataItem(),
$requestOptions
);
$count = count( $res );
}
// Check whether the current page has any other annotation for the
// same property
if ( $count < 1 && $this->isRegistered( $dataValue ) ) {
$dataValue->addErrorMsg(
[
'smw-datavalue-uniqueness-constraint-isknown',
$property->getLabel(),
$contextPage->getTitle()->getPrefixedText(),
$dataValue->getWikiValue()
]
);
$this->hasConstraintViolation = true;
}
// Has the page different values for the same property?
if ( $count < 1 ) {
return $this->hasConstraintViolation;
}
$this->hasConstraintViolation = true;
foreach ( $res as $dataItem ) {
$val = $dataValue->isValid() ? $dataValue->getWikiValue() : '...';
$text = '';
if ( $dataItem !== null && ( $title = $dataItem->getTitle() ) !== null ) {
$text = $title->getPrefixedText();
}
$dataValue->addErrorMsg(
[
'smw-datavalue-uniqueness-constraint-error',
$property->getLabel(),
$val,
$text
]
);
}
return $this->hasConstraintViolation;
}
private function canValidate( $dataValue ) {
if ( !$dataValue->isEnabledFeature( SMW_DV_PVUC ) || !$dataValue instanceof DataValue ) {
return false;
}
return $dataValue->getContextPage() !== null && $dataValue->getProperty() !== null;
}
private function isRegistered( $dataValue ) {
$contextPage = $dataValue->getContextPage();
$dataItem = $dataValue->getDataItem();
$property = $dataValue->getProperty();
$valueHash = md5( $property->getKey() . $dataItem->getHash() );
$key = $property->getKey();
$hash = $contextPage->getHash();
if ( isset( self::$annotations[$hash][$key] ) && self::$annotations[$hash][$key] !== $valueHash ) {
return true;
} else {
self::$annotations[$hash][$key] = $valueHash;
}
return false;
}
private function hasAnnotation( $dataValue ) {
$key = $dataValue->getProperty()->getKey();
$hash = $dataValue->getContextPage()->getHash();
return isset( self::$annotations[$hash][$key] );
}
}
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